Performance (Core Web Vitals)performance-core-web-vitals

https://toolkit-tests.pages.dev/perf/slow-lcp.html

FAIL

PageSpeed Insights · Lighthouse 13.4.1 · 2026-08-31T12:11:19.417Z

Field & lab, per strategy

mobile lab only (no field data yet)

No field data — this URL/origin doesn't have enough real-user traffic in CrUX yet. Showing lab only.

Lab — Lighthouse 13.4.1 · score 57

LCP10.68 spoor
CLS0.000good
FCP5.96 spoor
TBT0 msn/a
SI8.55 sn/a

LCP sub-parts (lab)

time to first byte1ms
resource load delay124ms
resource load time0ms
element render delay4148ms

element render delay — the browser waited before painting it

Top opportunities (lab)

0.76 s Avoid multiple page redirects

desktop lab only (no field data yet)

No field data — this URL/origin doesn't have enough real-user traffic in CrUX yet. Showing lab only.

Lab — Lighthouse 13.4.1 · score 58

LCP4.65 spoor
CLS0.004good
FCP4.65 spoor
TBT0 msn/a
SI4.82 sn/a

LCP sub-parts (lab)

time to first byte1ms
resource load delay79ms
resource load time0ms
element render delay4037ms

element render delay — the browser waited before painting it

Top opportunities (lab)

0.31 s Avoid multiple page redirects

Performance playbook

wiki disabled (--no-wiki)

Plain text 

Performance (Core Web Vitals) · performance-core-web-vitals
verdict: FAIL   engine: PageSpeed Insights (Lighthouse 13.4.1)
url: https://toolkit-tests.pages.dev/perf/slow-lcp.html
captured: 2026-08-31T12:11:19.417Z

[FAIL] mobile  (lab only (no field data yet))
   field — none (not enough real-user traffic in CrUX yet)
   lab — Lighthouse 13.4.1 · score 57:
     LCP   10.68 s  [poor]
     CLS   0.000  [good]
     FCP   5.96 s  [poor]
     TBT   0 ms
     SI    8.55 s
   top opportunities (lab):
     - 0.76 s  Avoid multiple page redirects
   LCP sub-parts (lab): time to first byte 1ms · resource load delay 124ms · resource load time 0ms · element render delay 4148ms
     → element render delay — the browser waited before painting it

[FAIL] desktop  (lab only (no field data yet))
   field — none (not enough real-user traffic in CrUX yet)
   lab — Lighthouse 13.4.1 · score 58:
     LCP   4.65 s  [poor]
     CLS   0.004  [good]
     FCP   4.65 s  [poor]
     TBT   0 ms
     SI    4.82 s
   top opportunities (lab):
     - 0.31 s  Avoid multiple page redirects
   LCP sub-parts (lab): time to first byte 1ms · resource load delay 79ms · resource load time 0ms · element render delay 4037ms
     → element render delay — the browser waited before painting it


PERFORMANCE PLAYBOOK
  wiki disabled (--no-wiki)